FindDriftTerm:

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Find the "deadband over drift rate sigma" term that results in the specified
probability "p" of NOT reaching the deadband by time "t".
Since version 7.
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Form:
[n,foundSoln] = FindDriftTerm( p, t );
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Inputs
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p (1) Probability that the deadband will NOT be reached
t (1) Time horizon [orbits]
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Outputs
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n (1) Deadband over drift rate sigma term
foundSoln (1) Flag indicating whether a solution was found or not
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